Integrate LLVM at llvm/llvm-project@8c1e3cbebfe9
Integrate LLVM at llvm/llvm-project@8c1e3cbebfe9

Updates LLVM usage to match
[8c1e3cbebfe9](https://github.com/llvm/llvm-project/commit/8c1e3cbebfe9)

PiperOrigin-RevId: 343125876

google-research/structured-additive-IR,google-research/structured-additive-IR